AU2001270480B2 - A Suction Apparatus with Noise Reduction Means - Google Patents
A Suction Apparatus with Noise Reduction Means Download PDFInfo
- Publication number
- AU2001270480B2 AU2001270480B2 AU2001270480A AU2001270480A AU2001270480B2 AU 2001270480 B2 AU2001270480 B2 AU 2001270480B2 AU 2001270480 A AU2001270480 A AU 2001270480A AU 2001270480 A AU2001270480 A AU 2001270480A AU 2001270480 B2 AU2001270480 B2 AU 2001270480B2
- Authority
- AU
- Australia
- Prior art keywords
- noise
- suction apparatus
- airflow
- noise reduction
- passage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
- F04D29/665—Sound attenuation by means of resonance chambers or interference
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electric Suction Cleaners (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Endoscopes (AREA)
- Massaging Devices (AREA)
Abstract
The invention concerns a suction apparatus with noise reduction means (7,8) in one or more airflow passages (2,3,4) for reducing noise emission from an airflow generator (1) or the like, wherein at least one airflow passage (2,3,4) is provided with at least one indentation with a predetermined depth (D) extending substantially perpendicularly to the general direction of the noise in the passage. By the invention, a suction apparatus with noise reduction means is provided which is simple and efficient at reducing noise and also inexpensive to manufacture. <IMAGE>
Description
1 A SUCTION APPARATUS WITH NOISE REDUCTION MEANS 0 Field of the Invention 0 The present invention relates to a suction apparatus with noise reduction means in one or more airflow passages for reducing noise emission from an airflow generator or the like.
Background of the Invention c1 WO-A-97/13443 discloses a suction apparatus of the above-mentioned kind Swhere the airflow generator is enclosed in a housing with an air inlet and an air outlet.
The housing and the outlet are provided with sound-absorbing foamed plastic materials.
This means that a significant noise reduction and a compact silencer may be obtained by providing the housing volume and at the outlet flow passages with a sound insulation material. Although this solution offers good dampening of the noise emission, this noise reduction solution comprises many different components and is therefore somewhat troublesome to assemble and consequently relatively expensive to manufacture.
Another solution to the noise reduction problem is known from EP-A-0 099 466, in which a vacuum cleaner is disclosed. This vacuum cleaner is provided with a soundabsorbing foam material around the motor housing and around the inlet and outlet passages lined with a sound-absorbing material. The outlet passages in this vacuum cleaner are designed with several changes in cross-section areas with bends in order to provide changes in the acoustical properties that lead to reflections of the noise. The vacuum cleaner is moreover provided with a dampener in front of the air inlet. Although this solution can provide an additional silencing effect, it is relatively extensive in dimensions and complex in design, making it cumbersome and relatively expensive to manufacture.
Another kind of noise reduction solution for a vacuum cleaner is known from 37 442, in which an insert unit is inserted in the air outlet that directs the airflow through a serpentine-like flow pattern. This noise reduction solution takes up a considerable amount of space and has a somewhat limited noise-reducing effect. Also, as the air is repeatedly diverted in this manner, it may cause an undesired loss in pressure.
[R:\LIBLL] 16309.doc: KEH 2 Another solution to noise reduction in a vacuum cleaner is known from 0 z EP-A-0 289 987, in which the exhaust passage is provided with a silencing passage consisting of a number of concentric air-tight tubular ribs defining a number of concentric exhaust airflow passages. A noise absorption material is provided along the upper walls of the passages. However, this solution is bulky in design and does not provide a 00 satisfactory noise reduction.
Normally, the airflow generator is made up by an electric motor connected to a blower, i.e. a radial ventilator. When the vacuum cleaner is only used for dry suction N cleaning, the primary airflow through the blower is also used for cooling the electric motor. However, when the vacuum cleaner is designed for use in a wet environment, the motor must be cooled by a separator cooling ventilator. Both the blower and the cooling ventilator cause emission of noise. The noise extends to the surroundings through the exhaust passage of the primary airflow and from the inlet and the exhaust air passages of the cooling air. The sound-absorbing material may be provided in the airflow passages or around the motor. However, the cooling ventilator is particularly difficult to silence in this manner due to the relatively short airflow passages. Furthermore, noise from the cooling ventilator is of a narrow band nature which makes it suitable for reduction by means of the described technique.
From JP 06 035478 A and JP 06 030860 A some other solutions concerning noise reduction of vacuum cleaners are known where a resonance type acoustic filter is provided. However, although this has a silencing effect their design is somewhat space consuming just as the production of these acoustic filters as an integral part of the vacuum cleaner housing is difficult and expensive.
Object of the Invention It is an object of the present invention to overcome or ameliorate some of the disadvantages of the prior art, or at least to provide a useful alternative.
Summary of the Invention The invention preferably provides a suction apparatus with noise reduction means which is simple to manufacture and with a compact structure so as to allow for a compact design of the device in which the airflow generator is installed.
[R:\LIBLL] 16309.doc:KEH O 3 There is also preferably disclosed herein a suction apparatus of the initially z mentioned kind, wherein at least one airflow passage is provided with a plurality of O indentations is arranged successively in the direction of the airflow, said indentations having a predetermined depth extending substantially perpendicularly to the general direction of the noise in the passage, and that the indentations are formed by providing 00 protruding wall members on at least one side of the flow passage.
By the invention, at least in a preferred embodiment a suction apparatus with noise reduction means is provided which is simple and efficient at reducing the noise and N also inexpensive to manufacture. The noise is dampened as it extends in an airflow passage. A suction apparatus according to at least a preferred embodiment of the invention is suitable for use in a vacuum cleaner with a separately cooled airflow generator by providing the airflow passages leading to the airflow generator and/or the ventilator with noise reduction means.
The principle at work by noise reduction according to at least a preferred embodiment of the invention is that part of the noise that extends in the passage will extend into the indentations. At the bottom of the indentation, the noise will be reflected back into the passage. When the indentations have a depth corresponding to a of the wavelength of the noise, the noise wave reflected by the bottom of the indentation may interfere destructively with the noise in the passage. Hereby, the noise will be reduced at particular frequencies as the reflected noise will cancel out the noise in the passage, resulting in a considerable reduction in the noise level.
The wall members are preferably provided perpendicular to the direction of the airflow. The effect of the noise reduction is optimised when the height or heights of the wall members or indentations is/are n x 2 of the wave length of the noise to be reduced, where n is an integer number, including n=0. Hereby, the indentations may be particularly suitable for silencing noise at one or more predetermined frequencies by choosing an appropriate depth of the indentations. However, noise reduction not only occurs at the predetermined frequencies but also at frequencies in close proximity thereto.
A plurality of indentations is arranged successively in the direction of the airflow, whereby an improved effect of the noise reduction is obtained in a simple manner [R:\LIBLL] 16309.doc: KEH 1 4 and by a compact structure. Hereby, a noise filter may be integrally moulded in the parts 0 z making up the housing of the suction apparatus.
Preferably, the indentations are sub-diverted into sub-indentations in the transverse direction of the general direction of the airflow. The width of the indentations generally corresponds to the length and is shorter than the depth. Hereby, it is ensured 00 that the noise cannot travel "sideways" and fail to interfere with the remaining noise in the passage.
In a preferred embodiment, the indentations are formed by providing protruding N wall members on at least one side of the flow passage. Hereby, the noise reduction means may be integrally formed in the housing members defining the airflow passages. When a plurality of indentations is required, a plurality of wall members is provided. In a particular embodiment, a grid of protruding wall members is provided in the airflow passage.
In a first embodiment, the airflow generator is separately cooled and provided Is with noise reduction means in one or more of the airflow passages. Alternatively, the airflow generator may be cooled by the primary airflow generated.
Brief Description of the Drawings A preferred embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings, wherein: Fig. 1 is a schematic side view of a suction apparatus; Fig. 2 is a principle illustration explaining the noise reduction principle according to an embodiment of the invention; Fig. 3 is a cross-section view of a suction apparatus according to a first embodiment of the invention; Fig. 4 is a perspective view of a lid part of a suction apparatus with a noise reduction means according to a second embodiment of the invention; Fig. 5 is a detailed schematic view incorporating a third embodiment of the noise reduction principle according to the invention; and Fig. 6 is a detailed schematic view incorporating a fourth embodiment of the invention.
[R:\LIBLL] 16309.doc:KEH Detailed Description of the Preferred Embodiments 0 z Figure 1 is a schematic view of a vacuum cleaner with a separately cooled Sairflow generator 1. The airflow generator 1 comprises an electric motor 5 connected to a C€3 blower 6 for generation of the primary suction airflow in the suction hose 10. On top, the electric motor 5 is equipped with a cooling fan 12 for cooling the motor 00 Airflow passages 2, 3, 4 and 10 are provided in association with the blower 6 and Sthe fan 12. The vacuum generated by the blower causes a primary airflow through the air hose 13. This air is exhausted through the primary air outlet passage 4.
N Air for cooling of the electric motor 5 is drawn in through an inlet passage 2 by the fan 12. The utilised cooling air is exhausted through the cooling air outlet passage 3.
The noise generated by the airflow generator and/or by the velocity of the airflow travels through the passages 2, 3, 4, 10 from the noise-emitting source and into the surroundings irrespective of the general flow direction of the air (see arrow indications) in the passages.
In order to reduce this noise emission, one or more of the passages 2, 3, 4 may be provided with noise reduction means 7, 8. A noise reduction means according to the invention comprises a repeated structure such as shown in Fig. 2. According to the invention, the noise reduction means involves a number of indentations 7 extending from one of the passage walls substantially perpendicularly to the direction of the noise in the particular passage 2, 3, 4. The indentations 7 are successively arranged in [R:\LIBLL] 16309.doc: KEH WO 02/05697 PCT/DK01/00465 6 the direction of the airflow and are separated by wall members 8. The indentations 7 are provided with a predetermined depth D that generally corresponds to the frequency of the noise in the passage to be silenced.
The depths of the indentations 7 may not necessarily be the same but may vary in order to reduce noise over a broader range of frequencies. This, however, is achieved at the expense of a less efficient noise reduction.
Part of the noise-travelling through the passage 2, 3, 4 will extend into the indentations 7. At the bottom of the indentations 7, the noise is reflected back into the passage 2, 3, 4. The reflected noise is delayed and is thus out of phase with the noise in the passage. This results in a destructive interference of the reflected noise and noise in the passage, generating a significant noise reduction. The noise-reducing effect is optimised when the noise has a frequency that corresponds to a indentation depth D of A, 5/4, etc. of the wave length. Moreover, the effect is also improved if the indentations extend across the entire width of the passage and/or if several indentations are provided successively.
In a vacuum cleaner, the noise from the airflow generator is at its most intense level within the frequency range 1 kHz to 5 kHz. The cooling ventilator in a separately cooled motor scatters noise at a somewhat higher frequency within in the range of 2 kHz to 7 kHz.
In table 1, the preferred depths D of the indentations 7 are indicated for dampening noise within a relevant frequency range: Depth D Dampening at Dampening at Dampening at 86 mm 1 kHz 3 kHz 5 kHz 43 mm 2 kHz 6 kHz 17 mm 5 kHz 12 mm 7 kHz WO 02/05697 PCT/DK01/00465 7 Table 1: Indentation depths and their corresponding frequencies of maximum dampening corresponding to or 5/4 of the wave length.
As it appears from table 1, the indentation depth D or height of the wall members 8 should preferably be between 17 mm and 86 mm. Increased depth is particularly advantageous, as it provides a dampening effect at more frequencies within the relevant frequency range.
A noise reduction means according to the invention is advantageous as the noise reduction may be integrated in passage defining parts of the vacuum cleaner and produced in a mouldable plastic material by an injection moulding process. This means that no extra sound-absorbing elements need to be placed in the vacuum cleaner.
A first embodiment of the invention is shown in figure 3, where a number of thin wall members 8 extend downwards from the top passage wall and into the airflow passages 2, 3. Hereby, a number of indentations 7 are formed between the thin wall members 8. The length of the thin wall members 8 the depth D of the indentations 7) may vary, such as indicated in the figure, in order to adapt the noise reduction means to different frequencies.
In a second preferred embodiment, the top lid 9 of a vacuum cleaner is provided with a grid 11 of thin wall members 8 forming a number of cells acting as noise-reducing indentations 7, see fig. 4. The grid 11 may be integrally formed on the inside of the lid part 9. By using a grid, the indentations 7 are sub-divided so that noise is prevented from travelling "sideways" down into the grooves or indentations. The grid 11 is advantageous as it may be provided across the entire width of a passage wall, causing a significant noise reduction.
Other embodiments of the invention are shown in figures 5 and 6. In fig. 5, the noise reduction may be performed in a relative short air exhaust passage 4. In fig. 6, the WO 02/05697 PCT/DK01/00465 8 lower passage wall is provided with noise indentations separated by thin wall elements 14.
As it can be appreciated from the various embodiments, the principle of noise reduction according to the invention has a wide range of use and may be used to dampen noise in a vacuum cleaner which travels through a passage irrespective of its origin.
Claims (6)
- 2. The suction apparatus according to claim 1, wherein the heights of each of the wall members are 1/4 (2n 1)X, where X is the wave length of the noise to be reduced and n is an integer number, including n=O.
- 3. The suction apparatus according to claim 2, wherein the height of all the wall members provided in an airflow passage is the same.
- 4. The suction apparatus according to claim 1 or 2, wherein the heights of the wall members provided in an airflow passage are different in order to reduce noise at different frequencies. The suction apparatus according to any one of the preceding claims, wherein the indentations are sub-diverted into sub-indentations in the transverse direction of the direction of the noise.
- 6. The suction apparatus according to any one of the preceding claims, wherein a plurality of wall members of different thickness are provided.
- 7. The suction apparatus according to any one of the preceding claims, wherein the wall members are provided perpendicular to the direction of the airflow.
- 8. The suction apparatus according to any one of the preceding claims, wherein a grid of protruding wall members is provided in the airflow passage. [R:\LIBLL] 16309.doc: KEH o 9. The suction apparatus according to any one of the preceding claims, Z wherein the airflow generator is separately cooled. O A suction apparatus, substantially as herein described with reference to SFigures 1 to 6. 00 5 Dated 29 November, 2004 Nilfisk-Advance A/S Patent Attorneys for the Applicant/Nominated Person SSPRUSON FERGUSON [R:\LIBLL] 16309.doc:KEH
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00202505.4 | 2000-07-14 | ||
EP00202505A EP1172059A1 (en) | 2000-07-14 | 2000-07-14 | A suction apparatus with noise reduction means |
PCT/DK2001/000465 WO2002005697A1 (en) | 2000-07-14 | 2001-07-03 | A suction apparatus with noise reducion means |
Publications (2)
Publication Number | Publication Date |
---|---|
AU2001270480A1 AU2001270480A1 (en) | 2002-05-02 |
AU2001270480B2 true AU2001270480B2 (en) | 2005-01-13 |
Family
ID=8171803
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU7048001A Pending AU7048001A (en) | 2000-07-14 | 2001-07-03 | A suction apparatus with noise reducion means |
AU2001270480A Ceased AU2001270480B2 (en) | 2000-07-14 | 2001-07-03 | A Suction Apparatus with Noise Reduction Means |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU7048001A Pending AU7048001A (en) | 2000-07-14 | 2001-07-03 | A suction apparatus with noise reducion means |
Country Status (8)
Country | Link |
---|---|
US (1) | US7337876B2 (en) |
EP (2) | EP1172059A1 (en) |
AT (1) | ATE348561T1 (en) |
AU (2) | AU7048001A (en) |
DE (1) | DE60125367T2 (en) |
DK (1) | DK1303209T3 (en) |
ES (1) | ES2278759T3 (en) |
WO (1) | WO2002005697A1 (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
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CA2545977A1 (en) * | 2005-05-09 | 2006-11-09 | Emerson Electric Co. | Noise-reduced vacuum appliance |
DE102006022833A1 (en) * | 2006-05-16 | 2007-11-22 | BSH Bosch und Siemens Hausgeräte GmbH | Vacuum cleaner with at least one centrifugal separator |
US7631725B2 (en) * | 2006-10-06 | 2009-12-15 | Ingersoll Rand Company | Exhaust system |
SE533268C2 (en) | 2008-12-17 | 2010-08-03 | Electrolux Ab | Vacuum cleaner |
US20100246880A1 (en) * | 2009-03-30 | 2010-09-30 | Oxford J Craig | Method and apparatus for enhanced stimulation of the limbic auditory response |
CN102727134A (en) * | 2011-04-06 | 2012-10-17 | 乐金电子(天津)电器有限公司 | Noise reduction structure of casing cover of dust-absorbing motor |
CN102327878A (en) * | 2011-09-22 | 2012-01-25 | 上海亿力电器有限公司 | Low-noise high-pressure cleaning machine |
JP5775975B2 (en) | 2012-10-09 | 2015-09-09 | コーニンクレッカ フィリップス エヌ ヴェ | Exhaust grill |
US9752494B2 (en) | 2013-03-15 | 2017-09-05 | Kohler Co. | Noise suppression systems |
US9388731B2 (en) | 2013-03-15 | 2016-07-12 | Kohler Co. | Noise suppression system |
US9169750B2 (en) * | 2013-08-17 | 2015-10-27 | ESI Energy Solutions, LLC. | Fluid flow noise mitigation structure and method |
DE102015100426A1 (en) * | 2015-01-13 | 2016-07-14 | Alfred Kärcher Gmbh & Co. Kg | Cleaning device and method for reducing noise in a cleaning device |
EP3244784B1 (en) * | 2015-01-13 | 2021-10-06 | Alfred Kärcher SE & Co. KG | Suction device |
AU2015377942B2 (en) | 2015-01-13 | 2020-07-02 | Alfred Karcher Gmbh & Co. Kg | Suction device and method for operating a suction device |
CN104863681A (en) * | 2015-04-13 | 2015-08-26 | 成都陵川特种工业有限责任公司 | Exhaust pipe silencing method |
DE102017111910A1 (en) | 2017-05-31 | 2018-12-06 | Alfred Kärcher SE & Co. KG | cleaner |
CN114046273B (en) * | 2021-11-26 | 2023-05-02 | 西安科技大学 | Noise control method of local ventilator for coal mine |
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JPS5170971A (en) * | 1974-12-17 | 1976-06-19 | Matsushita Electric Ind Co Ltd | SHINKUSOJIKI |
JPH05199955A (en) * | 1992-01-27 | 1993-08-10 | Tokyo Electric Co Ltd | Vacuum cleaner |
JPH0630860A (en) * | 1992-06-26 | 1994-02-08 | Tokyo Electric Co Ltd | Vacuum cleaner |
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JPH0665332B2 (en) * | 1987-05-06 | 1994-08-24 | 株式会社日立製作所 | Vacuum cleaner |
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-
2000
- 2000-07-14 EP EP00202505A patent/EP1172059A1/en not_active Withdrawn
-
2001
- 2001-07-03 US US10/333,041 patent/US7337876B2/en not_active Expired - Lifetime
- 2001-07-03 ES ES01949276T patent/ES2278759T3/en not_active Expired - Lifetime
- 2001-07-03 EP EP01949276A patent/EP1303209B1/en not_active Expired - Lifetime
- 2001-07-03 AU AU7048001A patent/AU7048001A/en active Pending
- 2001-07-03 DK DK01949276T patent/DK1303209T3/en active
- 2001-07-03 WO PCT/DK2001/000465 patent/WO2002005697A1/en active IP Right Grant
- 2001-07-03 AT AT01949276T patent/ATE348561T1/en not_active IP Right Cessation
- 2001-07-03 DE DE60125367T patent/DE60125367T2/en not_active Expired - Lifetime
- 2001-07-03 AU AU2001270480A patent/AU2001270480B2/en not_active Ceased
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5170971A (en) * | 1974-12-17 | 1976-06-19 | Matsushita Electric Ind Co Ltd | SHINKUSOJIKI |
JPH05199955A (en) * | 1992-01-27 | 1993-08-10 | Tokyo Electric Co Ltd | Vacuum cleaner |
JPH0630860A (en) * | 1992-06-26 | 1994-02-08 | Tokyo Electric Co Ltd | Vacuum cleaner |
Also Published As
Publication number | Publication date |
---|---|
EP1172059A1 (en) | 2002-01-16 |
ATE348561T1 (en) | 2007-01-15 |
WO2002005697A1 (en) | 2002-01-24 |
US20040026167A1 (en) | 2004-02-12 |
DK1303209T3 (en) | 2007-04-10 |
EP1303209A1 (en) | 2003-04-23 |
AU7048001A (en) | 2002-01-30 |
DE60125367T2 (en) | 2007-09-27 |
EP1303209B1 (en) | 2006-12-20 |
DE60125367D1 (en) | 2007-02-01 |
US7337876B2 (en) | 2008-03-04 |
ES2278759T3 (en) | 2007-08-16 |
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MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |